12 April 2001 Use of high-power dye laser beams during long periods induces chemical vapor deposition
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The use of high power dye laser beams during long periods is difficult because the performances of the optical components are decreasing with time. To understand this phenomenon, a set-up for research of experimental conditions that can minimize this dramatic trend has been built. After being irradiated by a laser beam of some kW/cm2, the optical components are locally covered by droplets. The size of the droplets depends on experimental conditions. They can be eliminated by cleaning. The high absorption of the deposits (200 ppm to 1000 ppm) leads us to search experimental conditions to limit the layer deposition speed. XPS measurements prove that the contamination is merely made up of organic compounds and hydrogenated carbon. The experiments show that a clean room environment under a controlled airflow is not sufficient to assure a very slow deposition. Vacuum from 10-2 to 10-6 mbar is even worse than room conditions and only the presence of oxygen can limit or eliminate these deposits.
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Laurent Bruel, Laurent Bruel, Pierre Delmas, Pierre Delmas, } "Use of high-power dye laser beams during long periods induces chemical vapor deposition", Proc. SPIE 4347, Laser-Induced Damage in Optical Materials: 2000, (12 April 2001); doi: 10.1117/12.425035; https://doi.org/10.1117/12.425035


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